The result of the xrd , sem and tem analysis show that the densification process was controlled by the mechanical of liquid phase sintering with the addition of mgo and ce02 as the sintering aid . the mgo - ceo2 would react with the sio2 which was on the surface of the silicon nitride particles to from silicate liquid phase to accelerate the densification 通過xrd 、 sem 、 tem等測試結(jié)果表明,由于同時添加了mgo和ceo _ 2作為助燒劑,其致密化過程為液相燒結(jié),由燒結(jié)助劑和si _ 3n _ 4表面的sio _ 2反應(yīng)形成低熔點的硅酸鹽相,促進燒結(jié)致密化,冷卻后,在晶界形成玻璃體。